noun Medicine/Medical.
the transference of a disease from one person to another.

1600–10; < Latin vectiōn- (stem of vectiō a carrying). See vector, -tion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

vection vec·tion (věk'shən)
The transference of pathogens from the sick to the healthy by a vector.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The phenomenon of perceiving illusory self-motion from vision alone is called
Free con- vection currents are set up by the temperature difference between the
  cover and absorber.
The sum effect is that the heat transport, due to con- vection, becomes small.
Most river models are concerned only with downstream ad- vection and dispersion.
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